EP0613552A1 - Process connecting flange for pressure transducers - Google Patents

Process connecting flange for pressure transducers

Info

Publication number
EP0613552A1
EP0613552A1 EP93919006A EP93919006A EP0613552A1 EP 0613552 A1 EP0613552 A1 EP 0613552A1 EP 93919006 A EP93919006 A EP 93919006A EP 93919006 A EP93919006 A EP 93919006A EP 0613552 A1 EP0613552 A1 EP 0613552A1
Authority
EP
European Patent Office
Prior art keywords
process connection
connection flange
measuring
measuring cell
metallic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP93919006A
Other languages
German (de)
French (fr)
Other versions
EP0613552B1 (en
Inventor
Horst Glienke
Winfried Maier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Endress and Hauser SE and Co KG
Original Assignee
Endress and Hauser SE and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
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Priority claimed from DE9212768U external-priority patent/DE9212768U1/en
Priority claimed from DE19924231823 external-priority patent/DE4231823C2/en
Application filed by Endress and Hauser SE and Co KG filed Critical Endress and Hauser SE and Co KG
Publication of EP0613552A1 publication Critical patent/EP0613552A1/en
Application granted granted Critical
Publication of EP0613552B1 publication Critical patent/EP0613552B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
    • G01L19/06—Means for preventing overload or deleterious influence of the measured medium on the measuring device or vice versa
    • G01L19/0627—Protection against aggressive medium in general
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
    • G01L19/0007—Fluidic connecting means

Definitions

  • the invention relates to a process connection flange for pressure transducers with a detachable connection, with which the process connection flange is positively connected to the pressure measurement transducer and with connection means via which the pressure measurement transducer is in spatial connection with the measuring medium whose pressure is to be measured.
  • Such pressure sensors which are spatially and positively connected to the process connection flange, serve to measure the differential, positive and negative pressure; Flow of gases, vapors and liquids; and measure the level of a container hydrostatically.
  • Transmitter for differential pressure, Deltabar PMD 130 January 1991, in particular page 6, drawing “Structure of the Transmitter” by the applicant, such transducers consist of the actual ceramic measuring cell, which is arranged in the interior of the measuring cell housing, the annular measuring cell housing , and the two uniform mirror-image process connection flanges, which clamp the measuring cell with the measuring cell housing by means of detachable screw connections in a positive and sealing manner between them.
  • the measuring cell is connected to an electronic circuit via electrical connection lines.
  • the electronic circuit is enclosed by a housing.
  • the electronics housing also has connection means for the electrical connection of the measurement sensor to an energy supply and / or information processing center.
  • the electronics housing can also be equipped with a display device for direct display of the pressure his
  • holes penetrate the two process connection flanges. Those lines can be connected to the bores via which the measuring space and thus the measuring medium is spatially connected to the pressure transducer.
  • the measurement task of the transducer is to measure the pressure of aggressive or corrosive ones
  • connection flanges from a metallic material from a polymeric plastic which is resistant to most acids or bases.
  • the object of the invention is to propose a process connection flange which ensures that, apart from the ceramic material of the pressure measuring cell, only parts made of a plastic which is resistant to the aggressive and / or corrosive measuring media can come into contact with these media, and thereby , despite the high temperatures that occur, there is a dimensional stability of the plastic parts which ensures the pressure tightness of the pressure transducer.
  • FIG. 1 shows a pressure transducer in which the process connection flange according to the invention is used.
  • Figure 2 shows a section through the process connection flange.
  • Figure 3 shows a section through the process connection pin.
  • differential pressure transducer 1 shows a pressure sensor, which although the application of the invention is not limited thereto, for example a differential pressure sensor should be.
  • the differential pressure sensor has two opposite process connection flanges, both of which are constructed and arranged in mirror image.
  • differential pressure transducer 1 only one side of differential pressure transducer 1 is considered below.
  • the pressure sensor 1 is composed of the ceramic measuring cell 2, the measuring cell housing 3 enclosing the measuring cell 2, the process connection flanges 4 and 5, the process connection pin 6, 7 and the electronics housing 8.
  • a releasable screw-nut connection 10 11 the process connection flanges 4, 5 are clamped against one another in such a way that they assume a position in which they clamp the measuring cell housing 3 between them.
  • the process connection flanges 4, 5 are supported, including ring-shaped seals 12, 13, both on the measuring cell housing 3 and on the ceramic measuring cell 2.
  • the cylindrical intermediate piece 31 establishes the spatial connection between the measuring cell housing 3 and the electronics housing 8. Inside the intermediate piece 31 are
  • the electrical lines are arranged, via which the measuring cell 2 is in electrical connection with the electronic circuit located inside the electronics housing 8.
  • a hexagon 81 is formed on the electronics housing 8.
  • the hexagon 81 serves to introduce a torque, with the aid of which the electronics housing 8 has a thread (not shown) with the thread (not shown) of the
  • the electronics housing 8 also encloses electrical connection elements via which the Pressure transducer is in electrical connection with an energy supply and / or information processing center.
  • the electronics housing 8 can also be equipped with an electrical display device which displays an electrical measured value which corresponds to the pressure of the measuring medium determined by the pressure measuring cell.
  • the flange-shaped surface 14 with the threaded bores 15 is intended for fastening the measuring sensor 1 at the measuring location.
  • the pressure measuring cell 2 To record the measured value, it is necessary for the pressure measuring cell 2 to be spatially connected to the measuring chamber, in the interior of which the measuring medium is located, and thus to the measuring medium itself.
  • This spatial connection is established via a connection line, not shown, which is connected at one end to the wall surrounding the measuring chamber and at the other end to the process connection flange 4.
  • a bore 61 penetrates the process connection flange 4.
  • the bore 61 opens into a short cylindrical cavity 62 (FIG. 3) which serves to uniformly press the pressure of the measuring medium onto the circular surface of the measuring membrane 21 to distribute.
  • an internal thread 63 is introduced into the bore 61.
  • the ceramic measuring cell has this property. If a suitable material is selected, this is also the case for the connecting line.
  • the metallic process connection flanges can very often not be used with extremely aggressive and corrosive media. It must therefore be based on a non-metallic material, e.g. B. on a polymeric plastic.
  • such plastics have the disadvantage that their dimensional stability decreases sharply with increasing heating, so that a seal between the measuring cell 2 and the interior space of the measuring cell housing 3, and between the measuring cell housing 3 and the environment is also no longer guaranteed by the inclusion of the ring-shaped seals 12 and 13.
  • a process connection pin 6 which penetrates the process connection flange 4 so that apart from the measuring membrane 21 only the process connection pin 6 can come into contact with the measuring medium.
  • a process connection pin 6 is provided which penetrates the process connection flange 4 so that apart from the measuring membrane 21 only the process connection pin 6 can come into contact with the measuring medium.
  • a bore 41 penetrates the process connection flange 4 coaxially with its axis of symmetry.
  • the process connection flange 4 is made as before from a dimensionally stable metallic material.
  • the lateral surface of the bore 41 is provided with an internal thread 42.
  • the bore 41 opens into a cylindrical section 43 of larger diameter.
  • the section 43 has a lateral surface 47. Due to the different diameters of the bore 42 and the cylindrical section 43, a radially extending annular shoulder 44 is formed on the bottom of the cylindrical section 43.
  • a groove 45 of rectangular cross section is formed on the end face of the process connection flange 4 facing the measuring cell 2.
  • the groove 45 coaxially surrounds the bore 41 in such a way that its axis of symmetry coincides with the axis of symmetry of the bore 41 and thus of the process connection flange 4.
  • the bottom of the groove 45 is broken through by a further groove 46.
  • the housing wall of the measuring cell housing 3 is supported on the bottom of the groove 45 and is pressed against the annular seal 12 arranged in the groove 46.
  • FIG. 3 shows a section through the process connection pin 6, which is made of a polymeric plastic, advantageously from a polyvinylidene fluoride (PVDF).
  • the process connection pin 6 is composed of a longer section of smaller diameter 64 and a shorter section of larger diameter Diameter 65 together.
  • the outer surface of section 64 is provided with an external thread 66.
  • an annular shoulder 67 is also formed on the process connection pin 6 due to the different diameters of the sections 64 and 65, which extends radially and runs around the section 64 at right angles.
  • a groove 68 also runs coaxially to the axis of symmetry of the bore 61 and thus that of the process connection pin 6, the cylindrical cavity 62.
  • the connecting pin is screwed into the internal thread 42 of the Prozeßan ⁇ circuit pin 4 6 so m with sides n e exterior thread 66 that the portion 64 penetrates the bore 41 and the shoulder 67 is supported on the shoulder 44 in the process.
  • a short piece of the section 65 of the process connection pin 6 penetrates the cylindrical section 43 of the process connection flange 4.
  • the shoulder 44 absorbs all axial forces and the lateral surface 47 of section 43 all radial forces, which are caused by a temperature-related deformation of the polymer material start from the process connection pin 6.
  • the measuring cell 2 is sealed off from the interior of the measuring cell housing 3 by means of the sealing surfaces 69, 21 and the seal 13 is now ensured that the measuring medium, apart from the ceramic material of the measuring cell 2 and the polymeric plastic of the process connection pin 6, with no other Substances can connect.
  • the process connection pin 6 is supported and held by the metallic process connection flange 4 such that the sealing surfaces are sealed even at higher temperatures of the measuring medium or the process.
  • any other suitable connection form can be implemented.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

Pour mesurer la pression, il faut mettre le transducteur de pression en relation spatiale avec les milieux de mesure. A cet effet, le transducteur de mesure comporte des brides métalliques ou non métalliques de raccordement à un processus de traitement. Le problème est que dans la majorité des cas, les brides à disposition ne résistent pas à l'agressivité et/ou à la corrosion des milieux de mesure. Les brides non métalliques de raccordement à un processus de traitement présentent certes l'avantage d'être résistantes à ces milieux, mais par contre, elles n'ont pas de stabilité dimensionnelle à des températures élevées de traitement. L'invention suggère par conséquent de disposer un tourillon de raccordement à un processus de traitement, réalisé en plastique polymère résistant aux milieux de mesure, dans la bride de raccordement à un processus de traitement, de manière que les milieux de mesure ne puissent entrer en contact qu'avec le plastique résistant et que la stabilité dimensionnelle de la partie plastique, qui est fonction de la température, soit assurée par un maintien radial et axial fourni par la bride métallique.To measure pressure, the pressure transducer must be placed in a spatial relationship with the measurement media. For this purpose, the measurement transducer has metallic or non-metallic flanges for connection to a treatment process. The problem is that in the majority of cases, the flanges available do not resist the aggressiveness and / or corrosion of the measuring media. Non-metallic flanges for connection to a treatment process have the advantage of being resistant to these media, but on the other hand, they do not have dimensional stability at high treatment temperatures. The invention therefore suggests placing a trunnion for connection to a treatment process, made of polymer plastic resistant to measuring media, in the flange for connection to a treatment process, so that the measuring media cannot enter into. contact only with the resistant plastic and that the dimensional stability of the plastic part, which is a function of the temperature, is ensured by a radial and axial retention provided by the metal flange.

Description

Beschreibung description
Prozeßanschlußflansch für DruckmeßaufnehmerProcess connection flange for pressure transducers
Die Erfindung bezieht sich auf einen Prozeßanschlu߬ flansch für Druckmeßaufnehmer mit einer lösbaren Verbindung, mit welcher der Prozeßanschlußflansch mit dem Druckmeßaufneh¬ mer formschlüssig verbunden ist und mit Anschlußmitteln über welche der Druckmeßaufnehmer mit dem Meßmedium, dessen Druck gemessen werden soll, in räumlicher Verbindung steht.The invention relates to a process connection flange for pressure transducers with a detachable connection, with which the process connection flange is positively connected to the pressure measurement transducer and with connection means via which the pressure measurement transducer is in spatial connection with the measuring medium whose pressure is to be measured.
Solche in räumlicher und formschlüssiger Verbindung mit dem Prozeßanschlußflansch stehende Druckmeßaufnehmer dienen dazu, den Differenz-, Über- und Unterdruck; Durchfluß von Gasen, Dämpfen und Flüssigkeiten; sowie hydrostatisch den Füllstand eines Behälters zu messen.Such pressure sensors, which are spatially and positively connected to the process connection flange, serve to measure the differential, positive and negative pressure; Flow of gases, vapors and liquids; and measure the level of a container hydrostatically.
Nach dem allgemein bekannten Stand der Technik, wie er z. B. in dem ProspektAccording to the generally known state of the art, as z. B. in the prospectus
"Meßumformer für Differenzdruck, Deltabar PMD 130", Januar 1991, insbesondere Seite 6, Zeichnung "Aufbau des Meßumformers" der Anmelderin dargestellt ist, bestehen solche Meßumformer aus der eigentlichen keramischen Meßzelle, welche im Innen¬ raum des Meßzellengehäuses angeordnet ist, dem ringförmigen Meßzellengehäuse, sowie den zwei gleichförmigen spiegelbild¬ lich zueinander angeordneten Prozeßanschlußflanschen, welche die Meßzelle mit dem Meßzellengehäuse mittels lösbarer Schraubverbinduπgen formschlüssig und abdichtend zwischen sich einspannen. Die Meßzelle steht über elektrische Verbin¬ dungsleitungen mit einer elektronischen Schaltung in Verbin¬ dung. Die elektronische Schaltung ist von einem Gehäuse um¬ schlossen. Das Elektronikgehäuse weist außerdem Anschlußmit- tel zum elektrischen Verbinden des Meßwertaufnehmers mit einer Energieversorgungs- und/oder Informationsverarbeitungs¬ zentrale auf. Das Elektronikgehäuse kann aber auch mit einem Anzeigegerät zur direkten Anzeige des Druckes ausgestattet sein"Transmitter for differential pressure, Deltabar PMD 130", January 1991, in particular page 6, drawing "Structure of the Transmitter" by the applicant, such transducers consist of the actual ceramic measuring cell, which is arranged in the interior of the measuring cell housing, the annular measuring cell housing , and the two uniform mirror-image process connection flanges, which clamp the measuring cell with the measuring cell housing by means of detachable screw connections in a positive and sealing manner between them. The measuring cell is connected to an electronic circuit via electrical connection lines. The electronic circuit is enclosed by a housing. The electronics housing also has connection means for the electrical connection of the measurement sensor to an energy supply and / or information processing center. The electronics housing can also be equipped with a display device for direct display of the pressure his
Um nun die Meßzelle mit dem Meßmedium in räumliche Verbindung zu bringen, durchdringen Bohrungen die beiden Prozeßanschlußflansche. An die Bohrungen sind jene Leitungen anschließbar, über die der Meßraum und damit das Meßmedium mit dem Druckmeßaufnehmer in räumlicher Verbindung steht.In order to bring the measuring cell into spatial connection with the measuring medium, holes penetrate the two process connection flanges. Those lines can be connected to the bores via which the measuring space and thus the measuring medium is spatially connected to the pressure transducer.
Sehr häufig besteht die Meßaufgabe des Meßwertaufneh- ers in der Druckmessung von aggressiven oder korrosivenVery often, the measurement task of the transducer is to measure the pressure of aggressive or corrosive ones
Medien, sowohl gasförmiger als auch in fluidischer Form. Für solche Aufgaben ist es notwendig und üblich, die Prozeßan¬ schlußflansche aus einem Werkstoff herzustellen, welcher resistent gegen die Aggressivität oder Korrosivität der Meß- medien ist. Aber auch die ringförmigen Dichtungen, welche zwischen keramischer Meßzelle und den Prozeßanschlußflansche bzw. zwischen den Meßzellengehäuse und den Prozeßanschlu߬ flanschen eingespannt sind, müssen aus einem Werkstoff beste hen, welcher ebenfalls resistent gegenüber den Meßmedien ist Prozeßanschlußflansche aus hochlegierten, nicht rostendenMedia, both gaseous and fluid. For such tasks it is necessary and customary to manufacture the process connection flanges from a material which is resistant to the aggressiveness or corrosiveness of the measuring media. However, the ring-shaped seals which are clamped between the ceramic measuring cell and the process connection flanges or between the measuring cell housing and the process connection flanges must also consist of a material which is also resistant to the measuring media. Process connection flanges made of high-alloyed, rustproof
Stählen, z. B. X 6 CrNiMoTi 17122 1.4571 oder hochkorrosions beständige Ni, Co, Cr, Mo, Fe - Legierungen sind besonders geeignet hierzu.Steels, e.g. B. X 6 CrNiMoTi 17122 1.4571 or highly corrosion resistant Ni, Co, Cr, Mo, Fe alloys are particularly suitable for this.
Bei der Anwendung von Druckmeßgeräten unter besonders schwierigen Bedingungen jedoch z. B. in einer Chemieanlage, besteht die Notwendigkeit, solche Medien messen zu müssen, deren Aggressivität und/oder Korrosivität weit über der Be¬ ständigkeit der üblicherweise verwendeten Flanschwerkstoffe liegt. Dies können z. B. Kupfer- oder Natriumchloride, Mi¬ schungen von Salz- und Salpetersäuren, oder Schwefelsäuren i erhitzten Zustand sein. Um zu Verhindern, daß der Aggressivi tät oder Korrosivität nichtbeständige Werkstoff mit dem Me߬ medien in Verbindung tritt, wurde bereits vorgeschlagen, Prozeßanschlußflansche statt aus einem metallischen Werkstof aus einem polymeren Kunststoff, welcher widerstandsf hig gegenüber den meisten Säuren oder Basen ist, herzustellen.When using pressure gauges under particularly difficult conditions, however, for. B. in a chemical plant, there is a need to measure those media whose aggressiveness and / or corrosiveness lies far above the resistance of the flange materials commonly used. This can e.g. B. copper or sodium chlorides, mixtures of hydrochloric and nitric acids, or sulfuric acids in the heated state. In order to prevent the aggressiveness or corrosiveness of non-resistant material from coming into contact with the measuring media, it has already been proposed to manufacture process connection flanges from a metallic material from a polymeric plastic which is resistant to most acids or bases.
Die mit dem Prozeßablauf in solchen Chemieanlagen ver- bundene hohe Erhitzung des Meßmediums bringt aber den Nach¬ teil, daß solche Kunststoffflansche zwar resistent gegenüber den Meßmedien sind, jedoch infolge der hohen Temperatur ihre Stabilität aufgeben, was zu Undichtigkeiten und damit gefähr- lichem Austreten von Meßmedien an den formschlüssigen Verbin¬ dungen zwischen den Prozeßanschlußflanschen und dem Meßzel¬ lengehäuse führen kann.Those associated with the process flow in such chemical plants Bound high heating of the measuring medium has the disadvantage that such plastic flanges are resistant to the measuring media, but give up their stability due to the high temperature, which leads to leaks and thus dangerous leakage of measuring media at the form-fitting connections between the Process connection flanges and the measuring cell housing can lead.
Demgegenüber stellt sich die Erfindung die Aufgabe, einen Prozeßanschlußflansch vorzuschlagen, welcher gewähr¬ leistet, daß außer dem keramischen Werkstoff der Druckmeßzel¬ le, nur Teile aus einem dem aggressiven und/oder korrosiven Meßmedien widerstandsfähigen Kunststoff mit diesen Medien in Verbindung treten kann, und dabei, trotz der auftretenden hohen Temperaturen, eine die Druckdichtheit des Druckme߬ aufnehmers gewährleistende Formstabilität der Kunststoffteile gegeben ist.In contrast, the object of the invention is to propose a process connection flange which ensures that, apart from the ceramic material of the pressure measuring cell, only parts made of a plastic which is resistant to the aggressive and / or corrosive measuring media can come into contact with these media, and thereby , despite the high temperatures that occur, there is a dimensional stability of the plastic parts which ensures the pressure tightness of the pressure transducer.
Gelöst wird diese Aufgabe durch die in dem Patentan- spruch 1 gekennzeichneten Merkmale. Weitere Merkmale der Erfindung sind in den Unteransprüchen gekennzeichnet.This object is achieved by the features characterized in patent claim 1. Further features of the invention are characterized in the subclaims.
Die Erfindung soll anhand der Zeichnungen weiter be¬ schrieben werden.The invention will be further described with reference to the drawings.
Es zeigenShow it
Figur 1 Einen Druckmeßaufnehmer, bei welchen der erfindungsgemäße Prozeßanschlußflansch zur Anwen- düng kommt.1 shows a pressure transducer in which the process connection flange according to the invention is used.
Figur 2 Einen Schnitt durch den Prozeßanschlußflansch.Figure 2 shows a section through the process connection flange.
Figur 3 Einen Schnitt durch den Prozeßanschlußzapfen.Figure 3 shows a section through the process connection pin.
In Figur 1 ist mit 1 ein Druckmeßaufnehmer dargestellt, der obwohl die Anwendung der Erfindung nicht darauf be¬ schränkt ist, beispielsweise ein Differenzdruckmeßaufnehmer sein soll. Zum messen des Differenzdruckes ist es notwendig, die Druckmeßzelle mit beiden Drücken zu beaufschlagen, des¬ halb besitzt der Differenzdruckaufnehmer zwei gegenüberlie¬ gende Prozeßanschlußflansche, die beide spiegelbildlich auf- gebaut und angeordnet sind. Der besseren Erklärung wegen, ist nachfolgend jedoch nur eine Seite des Differenzdruckaufneh¬ mers 1 betrachtet.1 shows a pressure sensor, which although the application of the invention is not limited thereto, for example a differential pressure sensor should be. To measure the differential pressure, it is necessary to apply both pressures to the pressure measuring cell, which is why the differential pressure sensor has two opposite process connection flanges, both of which are constructed and arranged in mirror image. For the sake of better explanation, however, only one side of differential pressure transducer 1 is considered below.
Der Druckmeßaufnehmer 1 setzt sich aus der keramischen Meßzelle 2, dem die Meßzelle 2 umschließenden Meßzellengehäu¬ se 3, den Prozeßanschlußflanschen 4 und 5, dem Prozeßan¬ schlußzapfen 6, 7, sowie dem Elektronikgehäuse 8 zusammen. Mittels einer lösbaren Schrauben-Muttern-Verbindung 10, 11 sind die Prozeßanschlußflansche 4, 5 so gegeneinander ge- spannt, daß sie eine Lage einnehmen, in welcher sie das Me߬ zellengehäuse 3 zwischen sich einspannen. Dabei stützen sich die Prozeßanschlußflansche 4, 5 unter Einschließen von ring¬ förmigen Dichtungen 12, 13 sowohl an dem Meßzellengehäuse 3 als auch an der keramischen Meßzelle 2 ab. Zur Herstellung der lösbaren Schrauben-Muttern-Verbindung 10, 11 durchdringen die Bolzen der Schrauben 10 die Prozeßanschlußflansche 4, 5.The pressure sensor 1 is composed of the ceramic measuring cell 2, the measuring cell housing 3 enclosing the measuring cell 2, the process connection flanges 4 and 5, the process connection pin 6, 7 and the electronics housing 8. By means of a releasable screw-nut connection 10, 11, the process connection flanges 4, 5 are clamped against one another in such a way that they assume a position in which they clamp the measuring cell housing 3 between them. The process connection flanges 4, 5 are supported, including ring-shaped seals 12, 13, both on the measuring cell housing 3 and on the ceramic measuring cell 2. To produce the releasable screw-nut connection 10, 11, the bolts of the screws 10 penetrate the process connection flanges 4, 5.
Das zylindrische Zwischenstück 31 stellt die räumliche Verbindung zwischen dem Meßzellengehäuse 3 und dem Elektro- nikgehäuse 8 her. Im Innern des Zwischenstückes 31 sindThe cylindrical intermediate piece 31 establishes the spatial connection between the measuring cell housing 3 and the electronics housing 8. Inside the intermediate piece 31 are
(nicht dargestellt) die elektrischen Leitungen angeordnet, über welche die Meßzelle 2 mit der im Innern des Elektronik¬ gehäuses 8 befindlichen elektronischen Schaltung in elek¬ trischer Verbindung steht.(not shown) the electrical lines are arranged, via which the measuring cell 2 is in electrical connection with the electronic circuit located inside the electronics housing 8.
Auf der, dem Zwischenstück 31 zugewandten Seite ist an dem Elektronikgehäuse 8 ein Sechskant 81 angeformt. Der Sechskant 81 dient der Einleitung eines Drehmomentes, mit dessen Hilfe das Elektronikgehäuse 8 über ein nicht darge- stelltes Gewinde mit dem nichtdargestellten Gewinde desOn the side facing the intermediate piece 31, a hexagon 81 is formed on the electronics housing 8. The hexagon 81 serves to introduce a torque, with the aid of which the electronics housing 8 has a thread (not shown) with the thread (not shown) of the
Zwischenstückes 31 des Meßzellengehäuses 3 verschraubt ist. Das Elektronikgehäuse 8 umschließt außer der elektrischen Schaltung auch elektrische Anschlußelemente, über welche der Druckmeßaufnehmer in elektrischer Verbindung mit einer Ener- gieversorgungs- und/oder Informatioπsverarbeitungszentrale steht. Das Elektronikgehäuse 8 kann außerdem mit einem elek¬ trischen Anzeigegerät ausgestattet sein, welches einen elek- trischen Meßwert anzeigt, der dem von der Druckmeßzelle er¬ mittelten Druck des Meßmediums entspricht. Die flanschförmige Fläche 14 mit den Gewindebohrungen 15 ist zur Befestigung des Meßwertaufnehmers 1 am Meßort bestimmt.Intermediate piece 31 of the measuring cell housing 3 is screwed. In addition to the electrical circuit, the electronics housing 8 also encloses electrical connection elements via which the Pressure transducer is in electrical connection with an energy supply and / or information processing center. The electronics housing 8 can also be equipped with an electrical display device which displays an electrical measured value which corresponds to the pressure of the measuring medium determined by the pressure measuring cell. The flange-shaped surface 14 with the threaded bores 15 is intended for fastening the measuring sensor 1 at the measuring location.
Zur Erfassung des Meßwertes ist es notwendig, daß die Druckmeßzelle 2 mit dem Meßraum, in dessen Inneren sich das Meßmedium befindet, und damit mit dem Meßmedium selbst in räumlicher Verbindung steht. Diese räumliche Verbindung ist über eine nichtdargestellte Verbindungsleitung hergestellt, welche an ihrem einen Ende an der, den Meßraum umschließenden Wandung und an dem anderen Ende an dem Prozeßanschlußflansch 4 angeschlossen ist. Zur räumlichen Verbindung der Verbin¬ dungsleitung mit der Meßzelle 2 durchdringt eine Bohrung 61 den Prozeßanschlußflansch 4. Die Bohrung 61 mündet in einem kurzen zylindrischen Hohlraum 62 (Fig. 3) welcher dazu dient, den Druck des Meßmediums gleichmäßig auf die Kreisfläche der Meßmembran 21 zu verteilen. Zum Anschluß der Verbindungslei¬ tung an dem Prozeßanschlußflansch 4 ist in die Bohrung 61 ein Innengewinde 63 eingebracht.To record the measured value, it is necessary for the pressure measuring cell 2 to be spatially connected to the measuring chamber, in the interior of which the measuring medium is located, and thus to the measuring medium itself. This spatial connection is established via a connection line, not shown, which is connected at one end to the wall surrounding the measuring chamber and at the other end to the process connection flange 4. For the spatial connection of the connecting line with the measuring cell 2, a bore 61 penetrates the process connection flange 4. The bore 61 opens into a short cylindrical cavity 62 (FIG. 3) which serves to uniformly press the pressure of the measuring medium onto the circular surface of the measuring membrane 21 to distribute. To connect the connecting line to the process connection flange 4, an internal thread 63 is introduced into the bore 61.
Um nun den Druck eines aggressiven oder korrosiven Mediums messen zu können, ist es erforderlich, nur solche Werkstoffe mit dem Meßmedium in Verbindung zu bringen, welche widerstandsfähig gegenüber diesen Medien sind. Die keramische Meßzelle besitzt diese Eigenschaft. Bei Wahl eines geeigneten Werkstoffes ist dies ebenfalls für die Verbindungsleitung der Fall. Die metallischen Prozeßanschlußflansche sind jedoch sehr häufig bei extrem aggressiven und korrosiven Medien nicht einsetzbar. Es muß deshalb auf einen nichtmetallischen Werkstoff, z. B. auf einen polymeren Kunststoff zurückgegrif¬ fen werden. Solche Kunststoffe haben aber den Nachteil, daß ihre Formstabilität mit zunehmender Erwärmung stark abnimmt, sodaß eine Abdichtung zwischen der Meßzelle 2 und dem Innen- räum des Meßzellengehäuses 3, sowie zwischen dem Meßzellenge¬ häuse 3 und der Umwelt auch durch den Einschluß der ringför¬ migen Dichtungen 12 und 13 nicht mehr gewährleistet ist. Zur Behebung dieser Nachteile ist ein Prozeßanschlußzapfen 6 vorgesehen, welcher den Prozeßanschlußflansch 4 ->Ü durch¬ dringt, daß außer der Meßmembran 21 nur der Prozeßanschlu߬ zapfen 6 mit dem Meßmedium in Verbindung treten kann. Ohne jedoch auf die, durch einen metallischen Flansch gegebene temperaturbeständige Stabilität des Prozeßanschlußflansches 4 zu verzichten.In order to be able to measure the pressure of an aggressive or corrosive medium, it is necessary to connect only those materials to the measuring medium which are resistant to these media. The ceramic measuring cell has this property. If a suitable material is selected, this is also the case for the connecting line. However, the metallic process connection flanges can very often not be used with extremely aggressive and corrosive media. It must therefore be based on a non-metallic material, e.g. B. on a polymeric plastic. However, such plastics have the disadvantage that their dimensional stability decreases sharply with increasing heating, so that a seal between the measuring cell 2 and the interior space of the measuring cell housing 3, and between the measuring cell housing 3 and the environment is also no longer guaranteed by the inclusion of the ring-shaped seals 12 and 13. In order to remedy these disadvantages, a process connection pin 6 is provided which penetrates the process connection flange 4 so that apart from the measuring membrane 21 only the process connection pin 6 can come into contact with the measuring medium. However, without sacrificing the temperature-resistant stability of the process connection flange 4 given by a metallic flange.
Wie aus Figur 2 ersichtlich ist, durchdringt eine Boh¬ rung 41 den Prozeßanschlußflansch 4 koaxial zu seiner Symme¬ trieachse. Der Prozeßanschlußflansch 4 ist wie bisher aus einem formstabilen metallischen Werkstoff hergestellt. Die Mantelfläche der Bohrung 41 ist mit einem Innengewinde 42 versehen. Auf der, der Meßzelle 2 zugewandten Seite mündet die Bohrung 41 in einem zylindrischen Abschnitt 43 größeren Durchmessers. Dabei weist der Abschnitt 43 eine Mantelfläche 47 auf. Durch die unterschiedlichen Durchmesser von Bohrung 42 und zylindrischen Abschnitt 43 ist an dem Boden des zy¬ lindrischen Abschnittes 43 eine, sich radial erstreckende ringförmige Schulter 44 ausgebildet. Weiter ist an der, der Meßzelle 2 zugewandten Stirnseite des Prozeßanschlußflansches 4 eine Nut 45 von rechteckigem Querschnitt angeformt. Die Nut 45 umläuft koaxial die Bohrung 41 derart, daß ihre Symmetrie¬ achse mit der Symmetrieachse der Bohrung 41 und damit des Prozeßanschlußflansches 4 zusammenfällt. Der Boden der Nut 45 ist durch eine weitere Nut 46 durchbrochen. Im zusammengebau- ten Zustand wird sich die Gehäusewand des Meßzellengehäυses 3 an dem Boden der Nut 45 abstützen und wird dabei gegen die in der Nut 46 angeordnete ringförmige Dichtung 12 gepresst.As can be seen from FIG. 2, a bore 41 penetrates the process connection flange 4 coaxially with its axis of symmetry. The process connection flange 4 is made as before from a dimensionally stable metallic material. The lateral surface of the bore 41 is provided with an internal thread 42. On the side facing the measuring cell 2, the bore 41 opens into a cylindrical section 43 of larger diameter. The section 43 has a lateral surface 47. Due to the different diameters of the bore 42 and the cylindrical section 43, a radially extending annular shoulder 44 is formed on the bottom of the cylindrical section 43. Furthermore, a groove 45 of rectangular cross section is formed on the end face of the process connection flange 4 facing the measuring cell 2. The groove 45 coaxially surrounds the bore 41 in such a way that its axis of symmetry coincides with the axis of symmetry of the bore 41 and thus of the process connection flange 4. The bottom of the groove 45 is broken through by a further groove 46. In the assembled state, the housing wall of the measuring cell housing 3 is supported on the bottom of the groove 45 and is pressed against the annular seal 12 arranged in the groove 46.
Figur 3 zeigt einen Schnitt durch den, aus einem poly- meren Kunststoff, vorteilhaft aus einem Polyvinylidenfluorid (PVDF) hergestellten Prozeßanschlußzapfen 6. Der Prozeßan¬ schlußzapfen 6 setzt sich aus einem längeren Abschnitt klei¬ neren Durchmessers 64 und einen kürzeren Abschnitt größeren Durchmessers 65 zusammen. Die Mantelfläche des Abschnittes 64 ist mit einem Außengewinde 66 versehen. Wie in der Bohrung 41 des Prozeßanschlußflansches 4 ist auch an dem Prozeßanschlu߬ zapfen 6 durch die unterschiedlichen Durchmesser der Ab- schnitte 64 und 65 eine ringförmige Schulter 67 ausgebildet, welche sich radial erstreckt und den Abschnitt 64 rechtwink¬ lig umläuft. An der, der Meßzelle 2 zugewandten Stirnfläche umläuft außerdem eine Nut 68 koaxial zur Symmetrieachse der Bohrung 61 und damit der des Prozeßanschlußzapfen 6 den zy- lindrischen Hohlraum 62. Im zusammgengebauten Zustand wird sich eine ringförmige Fläche außerhalb „der Membran 21 der Druckmeßzelle 2 an der, nicht von dem Hohlraum 62 durchbro¬ chenen, ringförmigen Dichtfläche 69, des Anschlußzapfens 6 abstützen und dabei gegen die, in der Nut 68 angeordnete ringförmige Dichtung 13 gepresst.FIG. 3 shows a section through the process connection pin 6, which is made of a polymeric plastic, advantageously from a polyvinylidene fluoride (PVDF). The process connection pin 6 is composed of a longer section of smaller diameter 64 and a shorter section of larger diameter Diameter 65 together. The outer surface of section 64 is provided with an external thread 66. As in the bore 41 of the process connection flange 4, an annular shoulder 67 is also formed on the process connection pin 6 due to the different diameters of the sections 64 and 65, which extends radially and runs around the section 64 at right angles. On the end face facing the measuring cell 2, a groove 68 also runs coaxially to the axis of symmetry of the bore 61 and thus that of the process connection pin 6, the cylindrical cavity 62. In the assembled state, an annular surface outside the membrane 21 of the pressure measuring cell 2 on the Do not support the annular sealing surface 69 of the connecting pin 6, which is not broken through by the cavity 62, and in doing so, press against the annular seal 13 arranged in the groove 68.
Um nun zu verhindern, daß das aggressive oder korrosive Medium mit dem metallischen Prozeßanschlußflansch 4 in Berüh¬ rung kommen kann, ist der Prozeßanschlußzapfen 6 so mit sei- nem Außengewinde 66 in das Innengewinde 42 des Prozeßan¬ schlußzapfens 4 eingeschraubt, daß der Abschnitt 64 die Boh¬ rung 41 durchdringt und sich dabei die Schulter 67 an der Schulter 44 abstützt. Dabei durchdringt ein kurzes Stück des Abschnittes 65 des Prozeßanschlußzapfens 6 den zylindrischen Abschnitt 43 des Prozeßanschlußflansches 4. Somit nimmt die Schulter 44 alle axialen und die Mantelfläche 47 des Ab¬ schnittes 43 alle radialen Kräfte auf, welche durch ein tem¬ peraturbedingtes Verformen des polymeren Werkstoffes von dem Prozeßanschlußzapfen 6 ausgehen.To prevent now that the aggressive or corrosive medium can tion come with the metallic process connection 4 in touch contact, the connecting pin is screwed into the internal thread 42 of the Prozeßan¬ circuit pin 4 6 so m with sides n e exterior thread 66 that the portion 64 penetrates the bore 41 and the shoulder 67 is supported on the shoulder 44 in the process. A short piece of the section 65 of the process connection pin 6 penetrates the cylindrical section 43 of the process connection flange 4. Thus, the shoulder 44 absorbs all axial forces and the lateral surface 47 of section 43 all radial forces, which are caused by a temperature-related deformation of the polymer material start from the process connection pin 6.
Durch den Anschluß der Verbindungsleitung an dem Proze߬ anschlußzapfen 6, und damit räumliche Verbinden der Meßzelle 2 über die Bohrung 61, mit der Verbindungsleitung, die Ab¬ dichtung der Meßzelle 2 gegenüber dem Innenraum des Meßzel- lengehäuses 3 mittels der Dichtflächen 69, 21 und der Dich¬ tung 13 ist nun gewährleistet, daß das Meßmedium, außer dem keramischen Werkstoff der Meßzelle 2 und dem polymeren Kunst¬ stoff des Prozeßanschlußzapfens 6, mit keinen anderen Werk- Stoffen in Verbindung treten kann. Dabei wird der Proze߬ anschlußzapfen 6 so, von dem metallischen Prozeßanschlu߬ flansch 4 gestützt und gehalten, daß auch bei höheren Tempe¬ raturen des Meßmediums oder des Prozesses die Dichtheit der Dichtflächen gewährleistet ist.By connecting the connecting line to the process connecting pin 6, and thus spatially connecting the measuring cell 2 via the bore 61, to the connecting line, the measuring cell 2 is sealed off from the interior of the measuring cell housing 3 by means of the sealing surfaces 69, 21 and the seal 13 is now ensured that the measuring medium, apart from the ceramic material of the measuring cell 2 and the polymeric plastic of the process connection pin 6, with no other Substances can connect. The process connection pin 6 is supported and held by the metallic process connection flange 4 such that the sealing surfaces are sealed even at higher temperatures of the measuring medium or the process.
Selbstverständlich kann anstelle des Anschlusses der Verbindungsleitung an dem Prozeßanschlußzapfen 6 über das Gewinde 62 jede andere geeignete Anschlußform realisiert sein. Of course, instead of connecting the connecting line to the process connection pin 6 via the thread 62, any other suitable connection form can be implemented.

Claims

Patentansprüche Claims
1. Prozeßanschlußflansch für einen Druckmeßaufnehmer mit einer lösbaren Verbindung, durch welche der Prozeßan¬ schlußflansch formschlüssig mit dem Druckmeßaufnehmer verbun¬ den ist und mit Anschlußmitteln, über welche der Druckmeßauf- nehmer mit den Meßmedien, dessen Druck gemessen werden soll, in räumlicher Verbindung steht, dadurch gekennzeichnet, daß der metallische Prozeßanschlußflansch (4) Verbindungsmittel (6) aus einem Meßmedien-beständigen, nichtmetallischen Kunst¬ stoff aufweist, über welche der Druckmeßaufnehmer (2) mit dem Meßmedien räumlich verbindbar ist.1. Process connection flange for a pressure sensor with a detachable connection through which the process connection flange is positively connected to the pressure sensor and with connection means via which the pressure sensor is spatially connected to the measuring media whose pressure is to be measured. characterized in that the metallic process connection flange (4) has connecting means (6) made of a measuring medium-resistant, non-metallic plastic, by means of which the pressure sensor (2) can be spatially connected to the measuring medium.
2. Prozeßanschlußflansch nach Anspruch 1, dadurch ge¬ kennzeichnet, daß die nichtmetallischen Verbindungsmittel (6) den metallischen Prozeßanschlußflansch (4) durchdringen.2. Process connection flange according to claim 1, characterized ge indicates that the non-metallic connecting means (6) penetrate the metallic process connection flange (4).
3. Prozeßanschlußflansch nach Anspruch 1, dadurch ge- kennzeichnet, daß die Verbindungsmittel ein Prozeßanschlu߬ zapfen (6) sind.3. Process connection flange according to claim 1, characterized in that the connecting means are a Prozessanschlu߬ pin (6).
4. Prozeßanschlußflansch nach Anspruch 3, dadurch ge¬ kennzeichnet, daß aus dem Innengewinde (42) des Prozeßan¬ schlußflansches (4) und dem Außengewinde (66) des Proze߬ anschlußzapfens (6) eine Schraubverbindung gebildet ist, durch welche der Prozeßanschlußzapfen (6) in dem Prozeßan- schlußflansch (4) eingesetzt und gehalten ist.4. Process connection flange according to claim 3, characterized in that from the internal thread (42) of the process connection flange (4) and the external thread (66) of the process connection pin (6) a screw connection is formed, through which the process connection pin (6 ) is inserted and held in the process connection flange (4).
5. Prozeßanschlußflansch nach Anspruch 3, dadurch ge¬ kennzeichnet, daß sich der Prozeßanschlußzapfen (6) axial an einer Schulter (44) und radial an einer Mantelfläche (47) des Prozeßanschlußflansches (4) abstützt. 5. Process connection flange according to claim 3, characterized ge indicates that the process connection pin (6) is supported axially on a shoulder (44) and radially on a lateral surface (47) of the process connection flange (4).
6. Prozeßanschlußflansch nach Anspruch 3, dadurch ge¬ kennzeichnet, daß der Prozeßanschlußzapfen (6) aus einem Polyvinilidenfluorid (PVDF) hergestellt ist.6. Process connection flange according to claim 3, characterized ge indicates that the process connection pin (6) is made of a polyvinylidene fluoride (PVDF).
7. Prozeßanschlußflansch nach Anspruch 2, dadurch ge¬ kennzeichnet, daß der zylindrische Hohlraum (62) gegenüber dem Inneren des Meßzellengehäuses (3) und das Meßzellengehäu¬ se (3) gegenüber der Umwelt abgedichtet ist.7. Process connection flange according to claim 2, characterized ge indicates that the cylindrical cavity (62) against the interior of the measuring cell housing (3) and the measuring cell housing (3) is sealed from the environment.
8. Prozeßanschlußflansch nach Anspruch 7, dadurch ge¬ kennzeichnet, daß sich der Prozeßanschlußflansch (4) mit dem Boden der Nut (45) unter Einschluß der ringförmigen Dichtung (12) an einer Ringfläche des Meßzellengehäuses (3) und gleichzeitig der Prozeßanschlußzapfen (6) mit der Dichtfläche (69) unter Einschluß der ringförmigen Dichtung (13) an einer ringförmigen Dichtfläche der Membran (21) der Meßzelle (2) dichtend abstützt. 8. Process connection flange according to claim 7, characterized ge indicates that the process connection flange (4) with the bottom of the groove (45) including the annular seal (12) on an annular surface of the measuring cell housing (3) and at the same time the process connection pin (6) sealingly supports with the sealing surface (69) including the annular seal (13) on an annular sealing surface of the membrane (21) of the measuring cell (2).
EP93919006A 1992-09-23 1993-09-15 Process connecting flange for pressure transducers Expired - Lifetime EP0613552B1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE4231823 1992-09-23
DE9212768U DE9212768U1 (en) 1992-09-23 1992-09-23 Process connection flange for pressure sensor
DE19924231823 DE4231823C2 (en) 1992-09-23 1992-09-23 Process connection flange for pressure transducers
DE9212768U 1992-09-23
PCT/DE1993/000870 WO1994007120A1 (en) 1992-09-23 1993-09-15 Process connecting flange for pressure transducers

Publications (2)

Publication Number Publication Date
EP0613552A1 true EP0613552A1 (en) 1994-09-07
EP0613552B1 EP0613552B1 (en) 1998-06-03

Family

ID=25918773

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93919006A Expired - Lifetime EP0613552B1 (en) 1992-09-23 1993-09-15 Process connecting flange for pressure transducers

Country Status (8)

Country Link
US (1) US5499539A (en)
EP (1) EP0613552B1 (en)
JP (1) JP2962831B2 (en)
CA (1) CA2123581C (en)
DE (1) DE59308646D1 (en)
DK (1) DK0613552T3 (en)
ES (1) ES2116465T3 (en)
WO (1) WO1994007120A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8119191B2 (en) 2003-01-16 2012-02-21 Parker-Hannifin Corporation Dispensable cured resin

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK0723143T3 (en) * 1995-01-12 1999-03-01 Endress Hauser Gmbh Co Apparatus for measuring pressure or differential pressure
DE102010063114A1 (en) * 2010-12-15 2012-06-21 Endress + Hauser Gmbh + Co. Kg Flange for pressure cells or diaphragm seal devices and method of making such flanges
DE102012108611B4 (en) * 2012-09-14 2022-06-15 Vega Grieshaber Kg transducer

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Publication number Priority date Publication date Assignee Title
DE204767C (en) *
US3618390A (en) * 1969-10-27 1971-11-09 Rosemount Eng Co Ltd Differential pressure transducer
WO1981003678A1 (en) * 1980-06-12 1981-12-24 Rosemount Inc Isolating apparatus for a pressure sensor flange
US4993265A (en) * 1988-03-03 1991-02-19 The Foxboro Company Protected pressure sensor and method of making
US5063784A (en) * 1988-06-06 1991-11-12 Ridenour Ralph Gaylord Refrigerant transducer assembly and method
US5313839A (en) * 1992-08-31 1994-05-24 Ridenour Ralph Gaylord Transducer assembly and method

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8119191B2 (en) 2003-01-16 2012-02-21 Parker-Hannifin Corporation Dispensable cured resin

Also Published As

Publication number Publication date
EP0613552B1 (en) 1998-06-03
JP2962831B2 (en) 1999-10-12
US5499539A (en) 1996-03-19
CA2123581C (en) 1999-12-07
ES2116465T3 (en) 1998-07-16
DK0613552T3 (en) 1999-03-22
JPH06511089A (en) 1994-12-08
DE59308646D1 (en) 1998-07-09
WO1994007120A1 (en) 1994-03-31
CA2123581A1 (en) 1993-09-15

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